SOURCE

function removeKeyEndWith(obj, letter) {
  Object.keys(obj).forEach(function (key) {
    if(key.match(letter+'$')) delete obj[key];
  });
}

var map = new Object(); 
map['aaa'] = "aaaa";
map['bbb'] = "bbbb";
map['cccRef'] = "CCCC";
map['dddRef'] = "DDDDD";

console.log(map);
removeKeyEndWith(map, 'Ref');
console.log(map);